Light bulb



FIG. 1 is a perspective view of a light bulb showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is an enlarged view of the light bulb taken from the circle portion in FIG. 6 . 

CLAIM The ornamental design for a light bulb, as shown and described. 